1. 根目录:
2. fs
3. ocfs2
4. inode.h

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * inode.h
 *
 * Function prototypes
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef OCFS2_INODE_H
#define OCFS2_INODE_H

#include "extent_map.h"

/* OCFS2 Inode Private Data */
struct ocfs2_inode_info
{
	u64			ip_blkno;

	struct ocfs2_lock_res		ip_rw_lockres;
	struct ocfs2_lock_res		ip_inode_lockres;
	struct ocfs2_lock_res		ip_open_lockres;

	/* protects allocation changes on this inode. */
	struct rw_semaphore		ip_alloc_sem;

	/* protects extended attribute changes on this inode */
	struct rw_semaphore		ip_xattr_sem;

	/* Number of outstanding AIO's which are not page aligned */
	atomic_t			ip_unaligned_aio;

	/* These fields are protected by ip_lock */
	spinlock_t			ip_lock;
	u32				ip_open_count;
	struct list_head		ip_io_markers;
	u32				ip_clusters;

	u16				ip_dyn_features;
	struct mutex			ip_io_mutex;
	u32				ip_flags; /* see below */
	u32				ip_attr; /* inode attributes */

	/* protected by recovery_lock. */
	struct inode			*ip_next_orphan;

	struct ocfs2_caching_info	ip_metadata_cache;
	struct ocfs2_extent_map		ip_extent_map;
	struct inode			vfs_inode;
	struct jbd2_inode		ip_jinode;

	u32				ip_dir_start_lookup;

	/* Only valid if the inode is the dir. */
	u32				ip_last_used_slot;
	u64				ip_last_used_group;
	u32				ip_dir_lock_gen;

	struct ocfs2_alloc_reservation	ip_la_data_resv;
};

/*
 * Flags for the ip_flags field
 */
/* System file inodes  */
#define OCFS2_INODE_SYSTEM_FILE		0x00000001
#define OCFS2_INODE_JOURNAL		0x00000002
#define OCFS2_INODE_BITMAP		0x00000004
/* This inode has been wiped from disk */
#define OCFS2_INODE_DELETED		0x00000008
/* Another node is deleting, so our delete is a nop */
#define OCFS2_INODE_SKIP_DELETE		0x00000010
/* Has the inode been orphaned on another node?
 *
 * This hints to ocfs2_drop_inode that it should clear i_nlink before
 * continuing.
 *
 * We *only* set this on unlink vote from another node. If the inode
 * was locally orphaned, then we're sure of the state and don't need
 * to twiddle i_nlink later - it's either zero or not depending on
 * whether our unlink succeeded. Otherwise we got this from a node
 * whose intention was to orphan the inode, however he may have
 * crashed, failed etc, so we let ocfs2_drop_inode zero the value and
 * rely on ocfs2_delete_inode to sort things out under the proper
 * cluster locks.
 */
#define OCFS2_INODE_MAYBE_ORPHANED	0x00000020
/* Does someone have the file open O_DIRECT */
#define OCFS2_INODE_OPEN_DIRECT		0x00000040
/* Tell the inode wipe code it's not in orphan dir */
#define OCFS2_INODE_SKIP_ORPHAN_DIR     0x00000080

static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
{
	return container_of(inode, struct ocfs2_inode_info, vfs_inode);
}

#define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
#define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)

extern struct kmem_cache *ocfs2_inode_cache;

extern const struct address_space_operations ocfs2_aops;
extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;

static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
{
	return &OCFS2_I(inode)->ip_metadata_cache;
}

void ocfs2_evict_inode(struct inode *inode);
int ocfs2_drop_inode(struct inode *inode);

/* Flags for ocfs2_iget() */
#define OCFS2_FI_FLAG_SYSFILE		0x1
#define OCFS2_FI_FLAG_ORPHAN_RECOVERY	0x2
struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
			 int sysfile_type);
int ocfs2_inode_init_private(struct inode *inode);
int ocfs2_inode_revalidate(struct dentry *dentry);
void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
			  int create_ino);
void ocfs2_read_inode(struct inode *inode);
void ocfs2_read_inode2(struct inode *inode, void *opaque);
ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
			size_t size, loff_t *offp);
void ocfs2_sync_blockdev(struct super_block *sb);
void ocfs2_refresh_inode(struct inode *inode,
			 struct ocfs2_dinode *fe);
int ocfs2_mark_inode_dirty(handle_t *handle,
			   struct inode *inode,
			   struct buffer_head *bh);
struct buffer_head *ocfs2_bread(struct inode *inode,
				int block, int *err, int reada);

void ocfs2_set_inode_flags(struct inode *inode);
void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);

static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
{
	int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;

	return (blkcnt_t)(OCFS2_I(inode)->ip_clusters << c_to_s_bits);
}

/* Validate that a bh contains a valid inode */
int ocfs2_validate_inode_block(struct super_block *sb,
			       struct buffer_head *bh);
/*
 * Read an inode block into *bh.  If *bh is NULL, a bh will be allocated.
 * This is a cached read.  The inode will be validated with
 * ocfs2_validate_inode_block().
 */
int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
/* The same, but can be passed OCFS2_BH_* flags */
int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
				int flags);

static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
{
	return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
}

#endif /* OCFS2_INODE_H */